$(document).ready(function() {
  var at = / at /;
  var dot = / dot /g;
  $('a.mail').each(function () {
 
    var addr = $(this).text().replace(at,"@").replace(dot,".");
    var addtext =  $(this).text().replace(at," [at] ").replace(dot," [dot] ");
    $(this).after('<a href="mailto:'+ addr +'" title="Send an email">'+ addtext +'</a>');
    $(this).remove();
  });
});